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110 lines
3.2 KiB
ReStructuredText
Executable File
110 lines
3.2 KiB
ReStructuredText
Executable File
.. _alpr_command_line:
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************************
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Command Line Utility
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************************
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The OpenALPR Command Line Interface (CLI) utility is a great way to quickly test ALPR against images, videos, or webcams. It is not recommended for sophisticated integration, since each time the CLI utility loads, it takes a number of seconds to initialize all of the OpenALPR recognition data.
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Usage
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------
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::
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alpr [-c <country_code>] [--config <config_file>] [-n <topN>] [--seek
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<integer_ms>] [-p <pattern code>] [--motion] [--clock] [-d] [-j]
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[--] [--version] [-h] <> ...
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Where:
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-c <country_code>, --country <country_code>
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Country code to identify (either us for USA or eu for Europe).
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Default=us
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--config <config_file>
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Path to the openalpr.conf file
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-n <topN>, --topn <topN>
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Max number of possible plate numbers to return. Default=10
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--seek <integer_ms>
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Seek to the specied millisecond in a video file. Default=0
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-p <pattern code>, --pattern <pattern code>
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Attempt to match the plate number against a plate pattern (e.g., md
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for Maryland, ca for California)
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--motion
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Use motion detection on video file or stream. Default=off
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--clock
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Measure/print the total time to process image and all plates.
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Default=off
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-d, --detect_region
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Attempt to detect the region of the plate image. [Experimental]
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Default=off
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-j, --json
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Output recognition results in JSON format. Default=off
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--, --ignore_rest
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Ignores the rest of the labeled arguments following this flag.
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--version
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Displays version information and exits.
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-h, --help
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Displays usage information and exits.
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<> (accepted multiple times)
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(required) Image containing license plates
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Examples
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-----------
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This command will attempt to recognize number plates in the /source/image.jpg image using the European-style recognition data. The config
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file is not provided on the CLI, so it will use the value in the environment variable 'OPENALPR_CONFIG_FILE' if provided, or the default
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location.
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::
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$ alpr -c eu /source/image.jpg
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This command will attempt to recognize number plates in the /source/image.png image using the default USA-style recognition data. The config
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file is not provided on the CLI, so it will read the configuration data from /tmp/openalpr.conf
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::
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$ alpr --config /tmp/openalpr.conf /source/image.png
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This command will attempt to recognize number plates in all jpeg images in the current directory image using the USA-style recognition data.
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$ alpr -c us *.jpg
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This command reads data from an input video (/source/video.mp4) and outputs recognition data as JSON.
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$ alpr -j /source/video.mp4
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This command processes a list of image files provided in /source/imagefilelist.txt and writes JSON results to /out/recognitionresults.txt.
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$ alpr -j stdin < /source/imagefilelist.txt > /out/recognitionresults.txt
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This command processes video from your webcam. You can also use /dev/video0, /dev/video1, etc. if you have multiple webcams.
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::
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$ alpr webcam
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